Ran the car for the first time on asphalt today. I used TC3 4° caster blocks up front. But I also had to use the TC3 outter hinge pins since the TC4 hinge pins were too big for the TC3 caster blocks. I also flipped the Front (rear) suspension block with the Rear (front) block to get less rear toe since I/we don't have the optional rear blocks yet. It was basically the same setup I used on my TC3.5. I would say the TC4 is just as fast.. if not faster than my TC3.5 from 2 weeks ago. The TC4 is a very nice car. Just can't wait til all the optional parts are available so I can tune it right.